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1 2016

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The Comparison of the Microstructure and Corrosion Resistance of Sand Cast Aluminum Alloys

Dobkowska A., Adamczyk–Cieślak B., Mizera J., Kurzydłowski K. J., Kiełbus A.

Archives of Metallurgy and Materials

2016

Vol. 61, iss. 1

209--212

The influence of different types of precipitation on the corrosion behavior was investigated in three aluminum-siliconmagnesium alloys. The microstructures of the alloys were studied through optical (OM) and scanning electron microscopy (SEM). The structures consisted of an α-Al solid solution matrix, Si eutectic crystals, secondary phases AlFeSi and AlMgFeSi (Chinese script), as well as Mg2Si. The corrosion behavior was examined with the use of a potentiodynamic polarization test followed by a SEM surface analysis. The results indicate that all the analyzed samples were in the passive state and AlSi10Mg was less reactive in the corrosive environment.